Diazotizable green azo dye.



' powders soluble in water, yielding upon re- '30-shades of excellent fastness to light vend flunrrnn e r-Anus PATEN @OFFlCE,

Answer-ennui: AND MATT'HI'ASLATTEN, or

' nssronons 1'0 snn zuurnnmxnu VORM. FRIED GERMANY, A CORPORATION or GERMANY.

No Brewing. Application filed Ap To all wfmmji mag concern: c p 1 Be it knownthct we; A'ucus'r BLANK and, 'MATTHIAB LATTEN, doctors of philosophy, fichemists, citizens of the German Empire, res siding at Leverlcusen, n'eal Cologne, Germany,have invented new;and useful Im provements in Diazotizable Green-lino. Dye,

of which the following is a. Specification;

r We-have found that para-eminobenzeneezolemino-S-naphthol sulfonicss'cids; pro-i:

duced e. g.' by combination of perai mtro diazobenzene chloricl with-l-emino-fi neph- 'thol sulfonic acids-in acid solution end by reduction of the compounds" thus produced, or by combination of diazotized-acidyl-perediemins with the-'saidecids and subsequent saponifica'tion of the compound "thus obtemed, can beconyerted into ureas 'bytreet- 1 ing them with l osgene'in the presence of gelkalis or of se ts acting like alkalis. The

new dyes one after being dried andupulver: ized in the shape of their alkaline salts dark duction with stannous chlorid and hydrochloric acid a; diamino-Iiaphthol sulfonic 'acid, a djamin and carbonic acid. The dyestuffs thus .obteined dye cotton in lbrown shades which ,on being developed, on the, ;fib erwith diazotized nitranilin yield green Jwashing which can be readily discharged.

" 'NH, o1=r- LEVERKU SEN, NEAR COLOGNE, GERMANY, R. BAYER & (10., 0F ELBERFELD,

DIAZOTIZABLE GEEEN nzo DYE.

Specification of i'ietters i l'titent. Patented Oct 17, 1911.

Ill. 1, 1911. ,Serial NO. 618,396.

The mixed dyestufl's produced by treating with phosgcne, one molecule of one of the above mentioned aminobenzcneezo-l-a mino-8-naphthol sulfonic acids and one molecule of an other pard-nminobenzene-azoaryl-sulf0n1c orcarboxylic acid possess the same qualities. p r

In order to illustrate the new process more fully the following examples are given, the parts being by weight:

EXa-mfple 1: 46'parts of the acid sodium salt 'o para-aminobenzene-ezo-amino-S- naphthol-4.6-disulfonic acid, obtained for instance-by combining one molecule ofpara-"BG nitro-diazoben'zene chlorid with one molecule of l-amino-S naphtholl.6-disulfonic ecid in acid solution and reducing the monoazo dyethus produced with sodium sulfid, are dissolved together with 34.5 parts of sodium carbonate in 3450 parts of hot water. Subsequently a current of phos'gene is passed through the solutionuntil the aminoazo compound is completely convertedinto the urea and the solution after having been stirred until the smell of phosgene has disappeared, is heated to 75 C. and the urea salted out, filtered and pressed.

The formation of the color takes proli- 'ebly place in accordance with the following formula:

with stannous chlorid and. hydrochloric acid carbonic acid, pera phcnylcnediamin and, 1.2 diamino-8rnaphthol-4fi-disulfonic acid, and, dyeing cotton "in brown shades which on being developed 'on' the fiber with 34-50 parts of hot water with the addition of 34.5 parts of sodium carbonate or of the equivalent quantity of a caustic alkali or of sodium acetateand the solution is treated at 50 C. with phosgene until the formation of the urea is complete. The solution is then. allowed to cool and the .dyestuil' is salted out by the addition of 359 parts of salt, filtered, pressed and dried.

The formation of the colortakes probably place, according to the following fordiazotized nitranilin yield green shades of excellent fastness to light and washing} which can be readily discharged.

Example 2: parts of the alniuoazoi compound obtained by combination of one i molecule of para-nitro-benzene-diazo chlorid with one molecule of l-amino-S-naphl thol-izlG-disultonic acid in acid solution and y subsequent reduction of the product thus obtained with sodium sultid, and lfifl parts oi the sodium salt of para-aminobenzene- 1 the shape of their alkaline salts dark powders soluble in water, yielding upon reduction with stannous chlorld and hydrochloric It dyes cotton in red-brown shades changing after combination with diazdtized paranitranilin into a bright green fast to light and washing which can be easily discharged.

Instead of para aniinobenzene azo l amino-S-naphthol (llSlll'fOlllC acids mentioued in the above examples, their homolog-g'ues or substitution products can be used such as alninotoluene-azo-l-aiuino-S-naphthol disullonic acids (produced from ortho-nilro-nieta-t luidin or meta-nitrd ortho-toluidin or from the corresponding acidyl toluylenedianiins), or the amino compounds obtained by combining the diazo compounds oi nitro-cresidin, 3-intro alchloro-(i-aniinoanisol and of nitroaminohydroquinonedialkylether with l.$-aminonaphthol sultonic acids and reducing the azo dyes thus produced. The corresponding dyestuils from aminonaphth ol monosultonic acids prove equally successful, in this case instead of para-nitranilin, etc., also the sultonic acids of vara-nitranilin or the corresponding acidyl para phenylenediauiin sultonic acids can be used;

The para-auiinobenzene-axe-salicylic acid mentioned in Example 2 can be replaced by the axe compounds obtained from diazosultonic or carboxylic acids and auilin, orthoor ineta-toluidin, para-Xylidiu and cresidin.

lVe claim 1. lhe herein described new dycsiulls bcing ureas containing a par.anninobeuzcucaao 1.8 alninonaphthol substance, which dyes are after being dried and pulrcrizcd in dianiin and carbonic acid; and dyeing cotton brown shades i ich on being developed on the fiber with duazotized nitranilin yield green shades of excellent fastness to light and washing which can be readily discharged, substantially as described.

2. The herein described new azo dye being the urea of para-a-minohenzene-azo-L amino-8maphtholi.G-disulfonic acid, which is after being dried and pulverized in the shape of its sodium salt a dark powder soluble in water with a bluish-red color, soluble acid a diaminonaphthol sulfonic acid, a

in concentrated sulfuric acid with a bluish- 

